SMS — Short Message Service — is the technology behind text messaging, and in e-commerce it has become one of the highest-performing owned marketing channels available. SMS commands open rates well above 90% and typical response times under three minutes, making it the highest-immediacy channel a Shopify brand has. That immediacy is also why SMS works best as a complement to email rather than a replacement: email carries longer-form storytelling and higher send volumes, while SMS is reserved for the handful of moments that are genuinely time-sensitive.
Transactional SMS — order confirmations, shipping updates, delivery notifications — are expected by customers and generate the highest engagement of any message type. They set expectations, reduce inbound customer service contacts, and create natural touchpoints for cross-sell follow-ups.
Promotional SMS — flash sales, product launches, back-in-stock alerts, limited-time offers — leverages SMS's immediacy for urgency-driven promotions. A back-in-stock text to customers who opted in for a specific product converts at exceptional rates, and a flash-sale text sent to an engaged segment consistently outperforms the same offer sent by email on immediate conversion. The key discipline is frequency: SMS is more intrusive than email, and over-messaging drives list churn and opt-outs faster than any other channel.
Automated flow SMS integrates text messages into the same behavioral automation infrastructure as email. An abandoned cart flow that leads with email but follows up with an SMS for non-openers typically recovers purchases that email alone misses, and a post-purchase flow that includes an SMS review request at the right post-delivery moment generates significantly more reviews than an email request alone.
Klaviyo is the dominant SMS platform for Shopify brands, handling email and SMS within a single automation and segmentation infrastructure; Attentive, Postscript, and SMSBump are pure-play SMS alternatives with strong Shopify integrations. All require explicit opt-in consent — a legal requirement in the US under TCPA and in the EU under GDPR — and support keyword-based opt-out (replying STOP to unsubscribe). Growing an SMS list requires dedicated collection points — popup incentives, checkout opt-ins, post-purchase prompts — distinct from email capture, since not every email subscriber consents to SMS; a healthy SMS list for a Shopify brand typically runs 20-40% of the email list size, with meaningfully higher engagement per message sent.
Two things get skipped when brands add SMS quickly. First, consent: opt-in language, quiet hours, and clean unsubscribe handling need to be right before the first send, not patched after a complaint. Second, measurement: every text costs money to send, so judge SMS on revenue per message rather than open rate — a channel with a 95% open rate that generates little revenue per send is still a bad channel to keep funding. Both are ordinary parts of email and SMS marketing setup, and both decide whether the channel holds up as a customer retention and loyalty asset.
Getting consent language, quiet hours, and opt-out handling right before the first send is a configuration task as much as a legal one, and those setup steps are covered in how to set up SMS marketing on Shopify.
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